title: Effect of administration route and dose of streptavidin or biotin on the tumor uptake of radioactivity in intraperitoneal tumor with multistep targeting.
abstract: The effect of the administration route and dose of streptavidin or biotin on the biodistribution of radioactivity in multistep targeting was studied in nude mice bearing intraperitoneal (IP) colon cancer xenograft. The multistep targeting included a two-step method using biotinylated antibody and radiolabeled streptavidin and a three-step method with radiolabeled biotin based on the two-step method. A monoclonal antibody, MLS128, which recognizes Tn antigen on mucin, was biotinylated and injected intravenously (i.v.) or i.p. in nude mice bearing human colon cancer LS180 IP xenografts for pretargeting. In the two-step method, i.p.-injected streptavidin showed a higher tumor uptake and tumor-to-nontumor ratios than i.v.-injected streptavidin regardless of administration route of pretargeting. The tumor uptake of radiolabeled streptavidin was increased with a high dose of biotinylated antibody pretargeting, but decreased with an increasing dose of streptavidin. In the three-step targeting, i.p. injection also gave a higher tumor uptake of radiolabeled biotin than i.v. injection. In conclusion, i.p. administration of radiolabeled streptavidin or biotin resulted in more efficient IP tumor targeting with the multistep methods.
authors.affiliation: Department of Nuclear Medicine, Faculty of Medicine, Kyoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Zhang
authors.forename: Z
authors.initials: Z
authors.lastname: Yao
authors.forename: H
authors.initials: H
authors.lastname: Sakahara
authors.forename: T
authors.initials: T
authors.lastname: Saga
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamoto
authors.forename: N
authors.initials: N
authors.lastname: Sato
authors.forename: S
authors.initials: S
authors.lastname: Zhao
authors.forename: H
authors.initials: H
authors.lastname: Nakada
authors.forename: I
authors.initials: I
authors.lastname: Yamashina
authors.forename: J
authors.initials: J
authors.lastname: Konishi
mesh_terms: D000818:Animals; D001710:Biotin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D006801:Humans; D007457:Iodine Radioisotopes; D007553:Isotope Labeling; D051379:Mice; D008819:Mice, Nude; D004369:Pentetic Acid; D010534:Peritoneal Neoplasms / Q000378:metabolism*; D019275:Radiopharmaceuticals; D019809:Streptavidin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D014018:Tissue Distribution
chemical_list: D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals; D001710:Biotin; D004369:Pentetic Acid; D019809:Streptavidin